Sundubu is a Korean stew made with an earthy red chile stock and delicate curds of silky tofu. Traditionally, sundubu is served in preheated stone bowls. You can re-create that effect by heating a stone bowl or a cast-iron pot in a 400° oven. Ladle the finished soup into the hot bowl or pot and serve from the stovetop, or carefully carry it to the table and place on a trivet.